Hi - a couple of questions I was hoping someone could help me with re the Polaroid theme. How do I delete the comments option from the bottom of posts? Also, how do I edit the menus at the bottom of my pages/posts? Thanks!

No problem :)
There are two possible solutions to that, I have a hunch that these three things are pages you've created in WordPress, correct?
If that's the case, and you want it to add any more pages you might create in the future, then you can do the following:

On your computer, create a folder named "polaroids-child"

In this folder, create a file called "style.css". Open this in a text editor, then paste the following code:

Hi, since I've found this useful post, I'd like to ask you some help with the Polaroid Theme.
More specifically, I would like to add the name of the author both at the beginning of the post (under the title of the post actually) AND on the polaroid, if possible.
Moreover, I would like to know how to translate the date of the post from English into Italian (now it's September, while I'd like the month name to be in my language).
Thank you for helping out!